import type { MetricsClient } from './connection';
import type { Retention } from './HistoryStore';
import { type MetricsKeys } from './keys';
export type LatencyMetric = 'runtime' | 'waittime';
export declare const QUEUE_AGE_METRIC = "queueage";
export declare class LatencyStore {
    private readonly redis;
    private readonly keys;
    readonly retention: Retention;
    constructor(opts: {
        redis: MetricsClient;
        keys: MetricsKeys;
        retention: Retention;
    });
    addSamples(queue: string, metric: LatencyMetric, hour: number, vector: number[]): Promise<void>;
    recordQueueAge(queue: string, hour: number, ms: number): Promise<void>;
    readRange(queue: string, metric: LatencyMetric, granularity: 'hour' | 'day', days: string[]): Promise<Record<string, number[]>>;
    readQueueAge(queue: string, granularity: 'hour' | 'day', days: string[]): Promise<Record<string, number>>;
    /** Epoch ms for an absolute hour index, for building response timestamps. */
    static hourToMs(hour: number): number;
}